Year-round ethanol blend bill passed by US House faces uncertain Senate path

Proponents of ethanol, including lawmakers from corn-growing states, say year-round sales of a gasoline blend containing 15% of the biofuel would give consumers a less expensive alternative to fill their gas tanks, boost energy supplies and benefit agricultural interests.

So why hasn’t Congress allowed it?

There’s credible skepticism about those claims — and opposition from the strange bedfellows of…